Keeping up with the Kardashians isn't easy - especially when you're the only son in the family. Now Rob Kardashian, who reportedly was so upset about his weight gain that he skipped his sister Kim's weight gain, has hired celebrity personal trainer Gunnar Peterson, reported People magazine on Thursday.

Gunnar has worked with Rob before, and describes him as "focused." The workout regime includes "intervals with strength movements: squats, the sled, swings and push presses. It's about getting his heart rate up and keeping it up," noted Gunar, author of "The Workout: Core Secrets from Hollywood's #1 Trainer."

And although others may focus on a number on the scale, Gunnar measures weight loss success in a different way. "I don’t have a scale, I'm not big on measurements. Until a person looks in the mirror and is happy with themselves, you have not reached your fitness goals," he asserted.

But for Rob, it's more than appearance. On a recent episode of "Keeping Up with the Kardashians," his blood test results caused his mother Kris Jenner to get serious.

Rob's physician listed diabetes and organ failures among the risks of his weight problems, according to Life & Style magazine. "This is life-threatening at this point," said Kris to her son.

But diet trumps exercise, according to Chris Powell, transformation specialist and star of "Extreme Weight Loss." He said on a recent episode of "The View" that without diet, exercise isn't enough to reverse obesity.

On "Keeping Up with the Kardashians," Kris announced plans to assist with the diet element. "It’s time for me to help Rob out, gain a little control, and get him a nutritionist and some help, so he can get his health back together," she proclaimed.

Will Rob get some family help from sister Kim, who recently shed 56 pounds? Colette Heimowitz, Vice President of Nutrition at the Atkins Diet, told E News that Kim used the high fat low carb ketogenic Atkins diet to restore her pre-baby body.

Share this article

Joanne Eglash has more than 25 years of experience as a freelance journalist and author. She's written articles, features, interviews, blogs, newsletters, and reviews for magazines such as Shape, Pregnancy and Success and for Web sites such as ediets and Yahoo. Joanne welcomes tips for her articles, which cover all aspects of health and lifestyles. She also is a freelance researcher and editor. Email her at snackscriber @ gmail.com